Tail-stock for lathes



(No Model.)

B. R. OSGOOD.

TAIL STOCK FOR LATHES.

No. 397,564. Patented Feb. 12, 1889.

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UNITED STATES PATENT OFFICE.

ELIJAl-I R. OSGOOD, OF COLUMBUS, OHIO.

TA|L=STOCK FOR LATHES.

SPECIFICATION forming part of Letters Patent No. 397,564, dated February12, 1889.

Application filed May 31, 1888- Serial No. 275,536. (No model.)

To aZZ whom it may concern.-

Be it known that I, ELIJAH R. OSGOOD, of Columbus, county of Franklin,and State of Ohio, have invented certain new and useful Improvements inTail-Blocks for Lathes, of which the following is a full, clear, andexact description, reference being had to the accompanying drawings, andto the letters of reference marked thereon.

My invention relates to tail-blocks for lathcs, and especially to meansfor adjusting and holding the spindle.

The object of my invention is to provide a durable and efficientappliance of few and simple parts by which the spindle may berapidly,certainly, and easily advanced or retracted and securely held, in anyposition or at any point to which adjusted; and to accomplish all ofthis my improvements involve certain new and useful arrangements orcombinations of parts and principles of operation, as will be 1 hereinfirst fully described, and then pointed out in the claims.

In the ZICOOIHIMULYUIQ' drawings, forming part of this specification,Figure 1 is a plan or top view of a tail-block having my improvemen isapplied thereto, the operating-lever being shown in full lines at oneposition and in dotted lines at another. Fig. 2 is a front elevation.Fig. is a cross-section upon aplane at-right angles to the spindle andpassing through the axis of the lever, which axis is adjusted to lie inthat plane. Fig. iis a plan view, on a scale enlarged beyond previousfigures, representing the under side of the adj usting and clampinglever and attached pinion, and showing a fragment of the spindle, theseparts being removed from the blocks.

In all these figures like letters of reference, wherever they occur,indicate corresponding parts.

A is the lower portion of the tail-block,which may be of any approvedform and arranged to slide directly on the ways of the lathe or 011asaddle on the ways, or in any other manner, and which may be int-endedfora lathe of any size, large orsmall. B is the spindle, arranged to bemoved back and forth in the direction of its length within thetail-block and intended to carry a center or other tool or appliance, asin any other construction. This spindle is provided with a rack or setof teeth with which those of a pinion, C, mesh. The pinion is journaledupon the tail-block. at one side, as upon a shaft, 0, which is rigidlyheld to the tail-block, as by a nut, b.

A lever, D, of sufficient length, is keyed or otherwise secured to thepinion C and travels over a segment, E, of which the edge is an arc of acircle having its center in the axis of the pinion. By moving the leverD in one direction or the other it is plain that the spindle will beadvanced or retracted, and the segment E is of such extent that thelever in traversing it will cause the spindle to move from nearly onelimit of travel to the other. Surrounding a shoulder upon the pinion isa collar, 0, the same being prevented from turning with the pinion by anapron, d, which bears against the adjacent portions of the block andalso operates to keep the pinion clear of foreign matters orobstructions, the collar 0 on the side next the lever bearing against arecess provided for it in the segment E. This collar constitutes onemember of a clutch, by which the lever, and therefore the spindle, issecurely held at any point to which adjusted.

Upon lever D is amovable clutch piece or block, F, arranged to bearagainst the beveled or otherwise shaped edge of the segment E. G is ahand-piece or handle of suitable length mounted upon leverD and threadedtl1ereon that is, the handle is provided with an interior screw-threador winding which engages with a corresponding thread or winding upon thelever. This handle G bears against the block F, or, better, against aloose washer, e, interposed between it and block F, to prevent wear. Theclutch parts being loose, the handle G may be instantly moved across thesegment E in either direction and to any desired extent. Then byslightly turning the handle in the proper direction (which, beingthreaded upon lever D, as above explained, is thereby caused to advance)the block Fand the collar c are forced against their bearings on thesegment E, firmly clutching the segment and thereby preventing thelever, and thus the spindle, from further movement. A slight turn of thehandle is all that is necessary to release the clutch. The collar 0,bearing against the segment E, prevents any clutching strain from beingbrought upon the shaft to and constitutes an enlarged bearing, whichobviates any danger of slipping. It also prevents turnings, &c., fromcollecting in the pinion.

By moving the lever far enough in either direction to clear the segmentcarrying the clutch-block F beyond its edge the lever and pinion may bedetached.

By the simple appliance thus far explained the spindle may be rapidlyadjusted and firmly set by What is practically one motion of the hand,thus avoiding the slow movement of the ordinary adjusting-screw and theseparate adjustment of the ordinary settingscrew.

The parts are few and simple, not liable to get out of order, and havebeen found to admirably answer the purpose or object of the invention aspreviously set forth.

The ease, accuracy, and certainty with which the adjustment may be madeand the work handled will commend the improvements to those skilled inthe use of lathes of any form.

Having 110w fully described my invention, what I claim as new herein,and desire to secure by Letters Patent, is

1. In a tail-blockfor lathes, a lever, a

3. In an attachment for lathes, a spindle, a

pinion, a lever connected with the pinion, the threaded handle mountedon the lever, and the collar and clutch-piece for clamping thesegment,combined and arranged substantially as shown, and for thepurposes set forth.

4. In combination with the tail-block carrying the pinion and spindle,the collar, and its apron, substantially as shown, and for the purposesset forth.

I11 testimony that I claim. the foregoing I have hereunto set my hand inthe presence of two witnesses.

ELIJAH R. OSGOOD.

W'itnesses:

HAROLD B. GATCH, GEO. E. HUNT.

